Multi-channel, covert, non-line-of-sight UV communication

Details Multi-channel, covert, non-line-of-sight UV communication Multi-channel, covert, non-line-of-sight UV communication

1988-03-08

1994-04-05

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

250374, 359109, 359172, H04B 1010, H04V 1402

Patent

active

053010515

ABSTRACT:
A system enables omnidirectional non-line-of-sight simultaneous communicans in a number of frequency separated channels in the ultraviolet spectrum. A plurality of discharge lamps each has at least a single different isotope of mercury for each omnidirectionally radiating a discrete line in the ultraviolet spectrum. Each of the discrete lines in the ultraviolet spectrum is modulated by an on-off sequence generator so that modulated discrete lines transmit communications to a number of receivers randomly disposed in a non-line-of-sight relationship to the discharge lamps. Aborption filters at each receiver contain a quenching gas and all the other isotopes of mercury except the one which generated the modulated discrete line of interest. Photons from the other discrete lines in the ultraviolet spectrum which do not contain the information of interest are dissipated and quenched by the isotopes responsive to the radiation and the quenching gas, so that the modulated discrete line in the ultraviolet spectrum passes through the filter and to a photo-multiplier tube where the information provides representative output pulses for appropriate use. Simultaneous communications within the solar blind region are assured for non-line-of-sight transmitters and receivers within a limited range so that communications are not compromised.

REFERENCES:
patent: 4286158 (1981-08-01), Charpak et al.
patent: 4376892 (1983-03-01), Charpak et al.
patent: 4379252 (1983-04-01), Work
patent: 4402090 (1983-08-01), Gfeller
patent: 4493114 (1985-01-01), Geller et al.

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